discomfit, discompose, untune, upset, disconcert - cause to lose one's composure

demoralize - confuse or put into disorder; "the boss's behavior demoralized everyone in the office"

bewilder, dumbfound, flummox, baffle, mystify, nonplus, perplex, puzzle, stupefy, amaze, gravel, vex, pose, stick, beat, get - be a mystery or bewildering to; "This beats me!"; "Got me--I don't know the answer!"; "a vexing problem"; "This question really stuck me"

disconcert, flurry, confuse, put off - cause to feel embarrassment; "The constant attention of the young man confused her"

disorient, disorientate - cause to be lost or disoriented

be - have the quality of being; (copula, used with an adjective or a predicate noun); "John is rich"; "This is not a good answer"